This is for the veteran programmers out there (you know who you are; you started programming before date 60000).
I'm in the middle of updates for our system, and I've come across many $ZU() calls. Most of them are documented in the "Replacement List", but two are missing: $ZUtil(0) and $ZUtil(1).
I honestly don't remember what these are for (and I'm pretty sure I used them in code in a previous century), so if someone can tell me, great. If you can provide a link to a reference, better!
As always, I appreciate your help.